阅读说明：本技术 一种低氯氨基酸肥的制备方法 (Preparation method of low-chlorine amino acid fertilizer ) 是由 于秋生 何剑飞 於慧利 张婷婷 冯镇泰 张红艳 郝祥蕊 于 2020-04-16 设计创作，主要内容包括：本发明公开了一种低氯氨基酸肥的制备方法,其包括,将蛋白源粉碎后调浆；调节pH至碱性,加热搅拌后,离心取滤液；调节pH至酸性,继续加热搅拌,离心取第一滤渣；将所述第一滤渣调浆,充分搅拌,再离心取第二滤渣；向所述第二滤渣中加入酸进行水解,调浆后脱色；通过阴、阳离子交换树脂后,通过浓缩、喷雾干燥,获得低氯、低盐氨基酸肥；所述阴离子交换树脂包括201x7、D201中的一种或几种,所述阳离子交换树脂包括001x7、001x4、001x10中的一种或几种。本发明所得低氯氨基酸肥中总氮≥12％、氨基酸态氮≥9％、氯化物含量≤2％,灰分≤5％,3-氯丙醇≤0.5mg/kg,收率≥80％,技术指标远高于目前市售产品(总氮在3％-5％之间,氨基酸态氮≤4％,灰分≥20％)。(The invention discloses a preparation method of a low-chlorine amino acid fertilizer, which comprises the steps of crushing a protein source and then mixing; adjusting pH to alkalinity, heating and stirring, centrifuging and taking filtrate; adjusting the pH value to acidity, continuously heating and stirring, and centrifuging to obtain first filter residue; mixing the first filter residue, fully stirring, and centrifuging to obtain a second filter residue; adding acid into the second filter residue for hydrolysis, and decoloring after size mixing; after passing through anion and cation exchange resin, obtaining low-chlorine and low-salt amino acid fertilizer by concentration and spray drying; the anion exchange resin comprises one or more of 201x7 and D201, and the cation exchange resin comprises one or more of 001x7, 001x4 and 001x 10. The low-chlorine amino acid fertilizer obtained by the invention has the total nitrogen content of more than or equal to 12 percent, the amino acid nitrogen content of more than or equal to 9 percent, the chloride content of less than or equal to 2 percent, the ash content of less than or equal to 5 percent, the 3-chloropropanol of less than or equal to 0.5mg/kg, the yield of more than or equal to 80 percent, and the technical indexes of the low-chlorine amino acid fertilizer are far higher than those of the current commercial products (the total nitrogen content is between 3 and.)

1. A preparation method of a low-chlorine amino acid fertilizer is characterized by comprising the following steps: comprises the steps of (a) preparing a mixture of a plurality of raw materials,

crushing a protein source and then mixing;

adjusting pH to alkalinity, heating and stirring, centrifuging and taking filtrate;

adjusting the pH value to acidity, continuously heating and stirring, and centrifuging to obtain first filter residue;

mixing the first filter residue, fully stirring, and centrifuging to obtain a second filter residue;

adding acid into the second filter residue for hydrolysis, and decoloring after size mixing;

after passing through anion and cation exchange resin, obtaining the low-chlorine and low-salt amino acid fertilizer by concentration and spray drying.

2. The method for preparing a low-chlorine amino acid fertilizer as claimed in claim 1, wherein: the anion exchange resin comprises one or more of 201x7 and D201, and the cation exchange resin comprises one or more of 001x7, 001x4 and 001x 10.

3. The method for preparing a low-chlorine amino acid fertilizer as claimed in claim 1, wherein: the protein source comprises one or more of soybean meal, peanut meal, corn meal, wheat meal, hair and cortex; the acid is hydrochloric acid; the decolorization is decolorization by using activated carbon.

4. The method for preparing a low-chlorine amino acid fertilizer as claimed in claim 3, wherein: the crushing is 60-80 meshes; the size mixing is carried out to 10-20%; the alkalinity is from pH 9 to 10; the acidity is pH to 4-5; the heating and stirring are carried out at 40-55 ℃.

5. The method for preparing a low-chlorine amino acid fertilizer as claimed in claim 3, wherein: the protein source comprises the following components in percentage by mass: the hydrochloric acid is 1: 3-1: 6.

6. The method for preparing a low chlorine amino acid fertilizer as claimed in any one of claims 1 to 5, wherein: the hydrolysis is carried out at the hydrolysis temperature of 105 ℃ and the hydrolysis time of 6-24 hours; and the decolorization is carried out by stirring the mixture for 15 to 30 minutes at a temperature of between 60 and 80 ℃ by using activated carbon and repeating the stirring for 2 times.

7. The method for preparing a low chlorine amino acid fertilizer as claimed in any one of claims 1 to 5, wherein the flow rate of the low chlorine amino acid fertilizer passing through the anion and cation exchange resins is 200 to 300m L/min.

8. The method for preparing a low chlorine amino acid fertilizer as claimed in any one of claims 1 to 5, wherein: spray drying, air inlet temperature: 170-190 ℃ and the air exhaust temperature is 80-95 ℃.

9. The low-chlorine amino acid fertilizer as claimed in any one of claims 1 to 8, characterized in that: according to the mass fraction, the total nitrogen in the low-chlorine amino acid fertilizer is more than or equal to 12 percent, the amino acid nitrogen is more than or equal to 9 percent, the chloride content is less than or equal to 2 percent, the ash content is less than or equal to 5 percent, and the yield is more than or equal to 80 percent.

Technical Field

The invention belongs to the technical field of agricultural fertilizers, and particularly relates to a preparation method of a low-chlorine amino acid fertilizer.

Background

In response to 'double reduction' engineering of agricultural production, the utilization ratio of chemical fertilizers in the current agricultural planting is reduced, various organic fertilizers are produced at the same time, and the market is gradually occupied. The use of common farmyard manure and organic fertilizer may cause the problems of pest and disease damage flooding and slow fertilizer efficiency, and the applicability in large-scale production is poor; amino acid fertilizers are well favored by growers due to the characteristics of easy dissolution, quick fertilizer effect and easy absorption, but most of the amino acid fertilizers sold in the market are obtained by neutralizing protein acid with liquid ammonia, wherein most of the effective components are ammonium salts, and the problems of soil salinization and high crop nitrate content caused by the large-range use of the ammonium salts are not suitable for long-term use; the amino acid fertilizer produced by the enzymolysis method has small amino acid ratio, slow fertilizer efficiency, high production cost and limited application range.

Therefore, the production of a fertilizer with low salt content and high amino acid content has great significance in agricultural production.

Disclosure of Invention

This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.

The present invention has been made in view of the above-mentioned technical drawbacks.

Therefore, as one aspect of the invention, the invention overcomes the defects in the prior art and provides a preparation method of a low-chlorine amino acid fertilizer.

In order to solve the technical problems, the invention provides the following technical scheme: a preparation method of a low-chlorine amino acid fertilizer comprises the steps of crushing a protein source and then mixing the crushed protein source with pulp; adjusting pH to alkalinity, heating and stirring, centrifuging and taking filtrate; adjusting the pH value to acidity, continuously heating and stirring, and centrifuging to obtain first filter residue; mixing the first filter residue, fully stirring, and centrifuging to obtain a second filter residue; adding acid into the second filter residue for hydrolysis, and decoloring after size mixing; after passing through anion and cation exchange resin, obtaining the low-chlorine and low-salt amino acid fertilizer by concentration and spray drying.

The preferable scheme of the preparation method of the low-chlorine amino acid fertilizer is as follows: the anion exchange resin comprises one or more of 201x7 and D201, and the cation exchange resin comprises one or more of 001x7, 001x4 and 001x 10.

The preferable scheme of the preparation method of the low-chlorine amino acid fertilizer is as follows: the protein source comprises one or more of soybean meal, peanut meal, corn meal, wheat meal, hair and cortex; the acid is hydrochloric acid; the decolorization is decolorization by using activated carbon.

The preferable scheme of the preparation method of the low-chlorine amino acid fertilizer is as follows: the crushing is 60-80 meshes; the size mixing is carried out to 10-20%; the alkalinity is from pH 9 to 10; the acidity is pH to 4-5; the heating and stirring are carried out at 40-55 ℃.

The preferable scheme of the preparation method of the low-chlorine amino acid fertilizer is as follows: the protein source comprises the following components in percentage by mass: the hydrochloric acid is 1: 3-1: 6.

The preferable scheme of the preparation method of the low-chlorine amino acid fertilizer is as follows: the hydrolysis is carried out at the hydrolysis temperature of 105 ℃ and the hydrolysis time of 6-24 hours; and the decolorization is carried out by stirring the mixture for 15 to 30 minutes at a temperature of between 60 and 80 ℃ by using activated carbon and repeating the stirring for 2 times.

The preferable scheme of the preparation method of the low-chlorine amino acid fertilizer is that the flow rate of the low-chlorine amino acid fertilizer passing through the anion exchange resin and the cation exchange resin is 200-300 m L/min.

The preferable scheme of the preparation method of the low-chlorine amino acid fertilizer is as follows: spray drying, air inlet temperature: 170-190 ℃ and the air exhaust temperature is 80-95 ℃.

As another aspect of the present invention, the present invention provides a low-chlorine amino acid fertilizer, wherein: according to the mass fraction, the total nitrogen in the low-chlorine amino acid fertilizer is more than or equal to 12 percent, the amino acid nitrogen is more than or equal to 9 percent, the chloride content is less than or equal to 2 percent, the ash content is less than or equal to 5 percent, and the yield is more than or equal to 80 percent.

The invention has the beneficial effects that:

1. the low-chlorine amino acid fertilizer obtained by the invention has the total nitrogen content of more than or equal to 12 percent, the amino acid nitrogen content of more than or equal to 9 percent, the chloride content of less than or equal to 2 percent, the ash content of less than or equal to 5 percent, the 3-chloropropanol of less than or equal to 0.5mg/kg, the yield of more than or equal to 80 percent, and the technical indexes of the low-chlorine amino acid fertilizer are far higher than those of the current commercial products (the total nitrogen content is between 3 and.

2. The low-chlorine amino acid fertilizer prepared by the invention can be used for foliar spraying in conventional planting, can also be widely applied to soilless culture, provides high-quality amino acid and short peptide for agricultural planting, and is wide in application.

3. The preparation process is simple and feasible, can be applied to laboratory preparation, and has industrial amplification feasibility.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:

FIG. 1 is a flow chart of a preparation process of a low-chlorine amino acid fertilizer.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with examples are described in detail below.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.

Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.